Hi Sean,
On Fri, Jul 30, 2021 at 10:42:30PM +0000, Sean Christopherson wrote:
> On Wed, Jul 21, 2021, Joerg Roedel wrote:
> This wording can be misread as "the hypervisor is responsible for _all_ cache
> management". Maybe just:
>
> /*
> * Ignore CLFLUSHes - the hyperivsor is responsible for cache
> * management of emulated MMIO.
> */
Right, will update the comment, thanks.
> Side topic, out of curisoity, what's mapping/accessing emulated MMIO as
> non-UC?
The CLFLUSHes happen when the kexec'ed kernel maps the VGA framebuffer
as unencrypted. Initially it is mapped encrypted and before re-mapping
the kernel flushes the range from the caches.
I have not investigated why this doesn't happen on the first boot,
though.
Regards,
Joerg
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